needing to keep them occupied

my son is very aggressive, and very whiny, my daughter is very aggressive and very mean. when they get bored it is like a war at home. We are coming off of a four day weekend. it is proving to be very difficult. My daughter already went though all her activity books, all her movies and all her new toys from her birthday. My son just wants to play gamecube. I do not adhere to hours of playing games but he is driving everyone nuts!